package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.connection.ReactiveStringCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate redisTemplate;

    public String tokenKey;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //如果符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //保存验证码到redis
        redisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);
        //结束
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //如果不符合，返回错误信息
            return Result.fail("手机号格式错误!");
        }
        //2. 校验验证码
        String cacheCode = redisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            //3.验证码不一致，报错
            return Result.fail("验证码错误!");
        }

        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if (user == null) {
            //6.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }

        // 7.保存用户信息到redis中
        // 7.1.随机生成token,作为登录令牌
        String token = UUID.randomUUID().toString(true);
        // 7.2.将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create().
                        setIgnoreNullValue(true).
                        setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        // 7.3存储
        tokenKey = LOGIN_USER_KEY + token;
        redisTemplate.opsForHash().putAll(tokenKey, userMap);
        //7.4设置token有效期
        redisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8.返回token
        return Result.ok(token);
    }

    @Override
    public Result logout() {
        redisTemplate.delete(tokenKey);
        return Result.ok("登出成功");
    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyy/MM"));
        //3. 拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int day = now.getDayOfMonth();
        //5.写入redis
        redisTemplate.opsForValue().setBit(key, day - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyy/MM"));
        //3. 拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int day = now.getDayOfMonth();
        //5.获取本月截止今天为止的所有签到记录，返回的是一个十进制数据
        List<Long> result = redisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(day)).valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }

        Long aLong = result.get(0);
        if (aLong == null || aLong == 0) {
            return Result.ok(0);
        }
        int count = 0;
        //6，循环遍历
        while (true) {
            //7.让这个数字与1做与运算，得到数字的最后一个bit位
            //判断这个bit位是否为0
            if ((aLong & 1) == 0) {
                //如果为0，说明未签到结束
                break;
            } else {
                //如果不为0，说明已签到，计数器加1
                count++;
            }
            //把数字右移一位
            aLong >>>= 1;
        }
        return Result.ok(count);
    }


    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomNumbers(10));
        //2.保存用户
        save(user);
        return user;
    }


}
